> What this article shows is that nearly all of the potential "shortages" in materials on earth are really just energy shortages (with some small number of notable exceptions like helium)
You're saying freshwater shortage is really just an energy shortage?
Unless you're in the middle of the Atacama or on the moon or something, yes.
We have near perfect processes for saltwater filtering.
Are you saying it isn’t?
Yes, absolutely. Look at places like Saudi Arabia and elsewhere in the Middle East that run on desalinization plants. It's energy, all the way down.